
There are no sign of life at the battlefront. Kakashi knows that the key to this war is psychological warfare. Kakashi orders everyone to rest and recharge their chakras. Sai has been asked to do Foundation's Sealing jutsu and Lee to be his bodyguard.
[GoogleAd]In doing sealing jutsu Sai releases massive amounts of feelings as chakra and this in turn results in negative destructive feelings. Danzo had warned him about the danger this Sealing jutsu represents. Sai must assimilate the mass of negative feelings. Release them but keep them constrained.
Deep at night Akatsuki attacks. First shinobi die. Kakashi does not want the ninjas to scatter. He needs them together and united. He asks Guy to work with two other teams and instruct other ones to do the same. In the meantime Kakashi needs to worry about support squads.

Akatsuki with explosive style came out of nowhere. Lee had to keep him busy as Ensui kept paralyzing and Sai sealing. Lee held his end of the bargain, but Ensui got hit and broke the Shadow Paralysis freeing the Blunt Blade. Sai understood that Lee's anger comes from his feelings for his friends.
Sai focused on his love for his friends rather than hate he has built up inside and produced a Tiger bullet that swallowed the Blunt Blade swiftly.
